Fixed #23444 -- Deprecated django.contrib.admin.helpers.InlineAdminForm.original_content_type_id

django/contrib/admin/helpers.py

@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+import warnings
+
 from django import forms
 from django.contrib.admin.utils import (flatten_fieldsets, lookup_field,
     display_for_field, label_for_field, help_text_for_field)
@@ -8,7 +10,9 @@ from django.core.exceptions import ObjectDoesNotExist
 from django.db.models.fields.related import ManyToManyRel
 from django.forms.utils import flatatt
 from django.template.defaultfilters import capfirst, linebreaksbr
+from django.utils.deprecation import RemovedInDjango20Warning
 from django.utils.encoding import force_text, smart_text
+from django.utils.functional import cached_property
 from django.utils.html import conditional_escape, format_html
 from django.utils.safestring import mark_safe
 from django.utils import six
@@ -270,16 +274,26 @@ class InlineAdminForm(AdminForm):
         self.formset = formset
         self.model_admin = model_admin
         self.original = original
-        if original is not None:
-            # Since this module gets imported in the application's root package,
-            # it cannot import models from other applications at the module level.
-            from django.contrib.contenttypes.models import ContentType
-            self.original_content_type_id = ContentType.objects.get_for_model(original).pk
         self.show_url = original and view_on_site_url is not None
         self.absolute_url = view_on_site_url
         super(InlineAdminForm, self).__init__(form, fieldsets, prepopulated_fields,
             readonly_fields, model_admin)
 
+    @cached_property
+    def original_content_type_id(self):
+        warnings.warn(
+            'InlineAdminForm.original_content_type_id is deprecated and will be '
+            'removed in Django 2.0. If you were using this attribute to construct '
+            'the "view on site" URL, use the `absolute_url` attribute instead.',
+            RemovedInDjango20Warning, stacklevel=2
+        )
+        if self.original is not None:
+            # Since this module gets imported in the application's root package,
+            # it cannot import models from other applications at the module level.
+            from django.contrib.contenttypes.models import ContentType
+            return ContentType.objects.get_for_model(self.original).pk
+        raise AttributeError
+
     def __iter__(self):
         for name, options in self.fieldsets:
             yield InlineFieldset(self.formset, self.form, name,

docs/internals/deprecation.txt

@@ -62,6 +62,9 @@ about each item can often be found in the release notes of two versions prior.
 * ``django.utils.checksums`` will be removed; its functionality is included
   in django-localflavor 1.1+.
 
+* The ``original_content_type_id`` attribute on
+  ``django.contrib.admin.helpers.InlineAdminForm`` will be removed.
+
 .. _deprecation-removed-in-1.9:
 
 1.9

docs/releases/1.8.txt

@@ -855,3 +855,11 @@ Luhn algorithm) was undocumented and not used in Django. The module has been
 moved to the `django-localflavor`_ package (version 1.1+).
 
 .. _django-localflavor: https://pypi.python.org/pypi/django-localflavor
+
+``django.contrib.admin.helpers.InlineAdminForm.original_content_type_id``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``original_content_type_id`` attribute on ``InlineAdminForm`` has been
+deprecated and will be removed in Django 2.0. Historically, it was used
+to construct the "view on site" URL. This URL is now accessible using the
+``absolute_url`` attribute of the form.

tests/admin_inlines/tests.py

@@ -1,11 +1,14 @@
 from __future__ import unicode_literals
 
+import warnings
+
 from django.contrib.admin import TabularInline, ModelAdmin
 from django.contrib.admin.tests import AdminSeleniumWebDriverTestCase
 from django.contrib.admin.helpers import InlineAdminForm
 from django.contrib.auth.models import User, Permission
 from django.contrib.contenttypes.models import ContentType
 from django.test import TestCase, override_settings, RequestFactory
+from django.utils.encoding import force_text
 
 # local test models
 from .admin import InnerInline, site as admin_site
@@ -403,6 +406,27 @@ class TestInlineAdminForm(TestCase):
         parent_ct = ContentType.objects.get_for_model(Parent)
         self.assertEqual(iaf.original.content_type, parent_ct)
 
+    def test_original_content_type_id_deprecated(self):
+        """
+        #23444 -- Verify a warning is raised when accessing
+        `original_content_type_id` attribute of `InlineAdminForm` object.
+        """
+        iaf = InlineAdminForm(None, None, {}, {}, None)
+        poll = Poll.objects.create(name="poll")
+        iaf2 = InlineAdminForm(None, None, {}, {}, poll)
+        poll_ct = ContentType.objects.get_for_model(Poll)
+        with warnings.catch_warnings(record=True) as recorded:
+            with self.assertRaises(AttributeError):
+                iaf.original_content_type_id
+            msg = force_text(recorded.pop().message)
+            self.assertEqual(
+                msg,
+                'InlineAdminForm.original_content_type_id is deprecated and will be '
+                'removed in Django 2.0. If you were using this attribute to construct '
+                'the "view on site" URL, use the `absolute_url` attribute instead.'
+            )
+            self.assertEqual(iaf2.original_content_type_id, poll_ct.id)
+
 
 @override_settings(PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',),
     ROOT_URLCONF="admin_inlines.urls")